Extraction system, extraction method for separating magnesium and extracting lithium and boron from magnesium-containing brine with complex solvent of secondary amide/alkyl alcohol as well as applications thereof
US12398046B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 17, 2022 |
| Grant date | Aug 26, 2025 |
| Priority date | — |
| Expiry date | Jan 14, 2044 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01D15/08
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The extraction system contains secondary amides and alkyl alcohols which are separately used as the extractants for extracting lithium and boron and consist of a single compound or a mixture of two or more compounds, and the total number of carbon atoms in their molecules are 12˜18 and 8˜20 respectively; the extraction system has a freezing point less than 0° C. With a volume ratio of an organic phase and a brine phase being 1˜10:1, at a brine density of 1.25˜1.38 g/cm3, at a brine pH value of 0˜7 and at a temperature of 0˜50° C., a single-stage or multi-stage countercurrent extraction and a stripping are conducted to obtain a water phase with a low magnesium-lithium ratio, which is subjected to concentration, impurity removal and preparation to get lithium chloride, lithium carbonate, lithium hydroxide and boric acid respectively. Water is used for stripping, greatly reducing the consumption of acid and base.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.